Elimination method and system of remaining echoes

An echo cancellation and noise cancellation technology, applied in the field of residual echo cancellation methods and systems, can solve the problems of poor whitening effect, reduced cancellation effect, spectrum leakage, etc., so as to improve accuracy, reduce spectrum leakage, and eliminate residual echo. Effect

Active Publication Date: 2013-09-25
SHANGHAI LINKCHIP SEMICON TECH CO LTD
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Problems solved by technology

[0007] The existing technical solution uses the AR model for whitening residual echo processing. Due to the limitation of system processing capacity, the voice signal needs to be truncated before processing. However,

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  • Elimination method and system of remaining echoes
  • Elimination method and system of remaining echoes

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Embodiment Construction

[0029] In order to make the object, technical solution and advantages of the present invention clearer, various embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. However, those of ordinary skill in the art can understand that, in each implementation manner of the present invention, many technical details are provided for readers to better understand the present application. However, even without these technical details and various changes and modifications based on the following implementation modes, the technical solution claimed in each claim of the present application can be realized.

[0030] The first embodiment of the present invention relates to a residual echo cancellation method, the process of which is as follows figure 2 shown. Specifically include the following steps:

[0031] Step S201, using a non-rectangular window to perform windowing processing on the residual echo signal e(k), to obtain th...

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Abstract

The invention relates to the field of voice communication, and discloses an elimination method and system of remaining echoes. Windowing processing is carried out on the remaining echoes by adopting a Hamming window or a Blackman window or other non-rectangular window, spectrum leakage can be reduced so that accuracy of linear prediction can be improved, residual error signals are made to be more similar to white noise, and therefore the remaining echoes can be eliminated better. Further, when the windowing processing is carried out on the residual echo signals, remaining echo signals of a base frame and the last N signals of a last frame can be combined to form the remaining echo signals needing to be process at present, and the spectrum leakage can be further reduced.

Description

technical field [0001] The invention relates to the field of voice communication, in particular to a residual echo cancellation method and system. Background technique [0002] In a voice communication system, after the remote input signal arrives at the local signal receiving device, it is processed by the local signal receiving device and reaches the earpiece. During this process, echoes are often generated. In echo cancellation, four processing modules are involved, which are adaptive filtering module, double-ended detection module, residual echo cancellation module, and noise cancellation module. The residual echo cancellation module and the noise cancellation module can be collectively referred to as the nonlinear processing part. Such as figure 1 shown. Among them, the adaptive filter is mainly used to track the echo reflection path and estimate the estimated echo signal The double-talk detector is used to control the update of the adaptive filter to prevent the fi...

Claims

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Application Information

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IPC IPC(8): H04M9/08
Inventor 王彦谢单辉许云峰王威
Owner SHANGHAI LINKCHIP SEMICON TECH CO LTD
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